Internal-combustion and other fluid-pressure engine indicator



Aug. 19, 1930.. A. REID 1,773,240

INTERNAL COMBUSTION AND OTHER FLUID PRESSURE ENGINE INDICATOR Filed Feb.5, 1927 3 Sheets-Sheet 1 g- 11930- A. REID 1,773,240

INTERNAL] COMBUSTION AND OTHER FLUID PRESSURE ENGINE INDICATOR FiledFeb. 5, 1927 J 3 Sheets-Sheet 2 L n 7" X 5% WSJJG I -27; W1 0 O v o 0lllll Aug. 19, 1930. A. REID 1,773,240

INTERNAL: COMBUSTION AND OTHER FLUID PRESSURE ENGINE INDICATOR FiledFeb. 1927 3 Sheets-Sheet 5 lNTA Ks EXHA usr 9 6 l r2 No Al lMFulfsEf a1TIA/TAKE 1 wa Patented Aug. 19, 1930 UNIT ED STATES PAT ENT i FFl CEALEXANDER REID, OF ABERDEEN, SCOTLAND, ASSIGNOR TO DOBBIE-MCINNES ANDCLYDE LIMITED. 01 GLASGOW, SCOTLAND INTERNAL-COMBUSTION ANDOTHERFLUID-PRESSURE ENGINE INDICATOR Application filed February 5, 1927.Serial 'No, 166,266, and in Great Britain February 6, 1926,

My invention relates to improvements in and connected. with internalcombustion and other i'liiiid-pressure engine indicating gear, andresides in tllG'PlOVlSlOIl of'mcansof ob taming from internal combustionengines of the Diesel or other systems, 111d101t01(l12tftl d t tht't 1ains 0 ie iaw 3pc, a ]S 0 say, con tinuous forward (not reciprocating)diagrams, as apart from pressure VOlllHlQ-(llib grams,and has for its obect to obtain these draw diagrams automatically, and also to ensure thetop dead centre line beingexactly in the centre ot the diagram, suchdraw diaenlargement of the incidents taking place'at thetop dead centreof the pressure volume diagram and from the draw diagiannthese incidentsbeing on a much enlarged scale,the points at which they issue can withthe aid of scales referred'to later, be located exactly in degrees orpiston movements and thereby enable any necessary engine adjustments tobe more accurately made.

In carrying out this invention, I provide a rocking or moving levermounted on a suitable frame fixed to the framework of the engine anddrivenby an adjustable outer disc clamped to the end of the cam-shaft bymeans of an inner disc; the fulcrum of the lever be ing also adjustable.The outer disc referred to has recesses in its face to correspond to thenumber and position of cylinders innthe engine. A spring-loaded crankpin connects the lever to a given hole or recess in this disc applicableto its particular cylinder. \Vhen it is desired to change over toanother cylinder the spring-loaded crank-pin is released by hand andplaced in the hole or recess on the outer disc corresponding to thecylinder of which indications are required.

The lever is further designed so that any wear can be counteracted byadjusting its fulcrum pin.

A special lever sliding on a fulcrum pin is supplied for a reversibleengine, thus making it possible to obtain a reversing diagram and alsoto indicate pressures and other factors when the engine is runningastern.

In order that my invention may be properly understood and readilycarried into effect,

gram being a distorted diagram showingan' l have hereunto appended threesheets of drawings, of which i Figure 1 is a front view of the aiiparatus illustrating my inventon.

Figure 2 is an elevation in section of Figure 1.

Figure 3 is a sectional. view of the cord attachment.

Figures 4, 5 and 6 are specimen diagrams taken by the apparatus of fourcycle engines.

Figures 7, 8 and 9 are specimen diagrams taken by the apparatus of twocycle engine;

Figure 10 is a specimen diagram taken when starting off a four cycleengine.

Figure 11 is a diagrammatic plan of part of a Dieselengine provided withmy improved indicating gear.

Referring to the drawings, A'is the rocking-or moving lever which issuitably pivoted to apin carried in a bracket C, which bracket C issuitably fixed to the framework D of the engine. The rocking lever A isslotted internal] y to carry a slider J which contains a spring-loadedcrank-pin K, the said springloaded crank-pin being of such a size to litinto the recesses I in the outer disc E. When the apparatus is not inuse the crankpin K is positioned in a recess P on the clamping disc G oris taken out through the walened slot, this recess P being in the centreof the clamping disc G and the slot A. being at thelower part of thelever A. The rocking lever Ais driven by the adjustable'outer disc Ewhich clamped to the end of the engine cam-shaft F, the said outer discE being rctained in position by the inner or clamping disc G which isscrewed to the end of the engine cam-shaft Fby studs or screws H whichmay be loosened baclr in order to adjust the rotary position of theouter disc E when being fitted to the engine. The recesses or notches Icut'in the surface of the outer disc E corre spend in number to theengine cylinders and in position to the top dead centre of each cylinderwhen firing takes place. The pivot pin B is capable of being adjustedabout the axisof the cam-shaft F by means-of a. quadrant-L which issuitably carried in the bracke D. Such adjustment is'necessary in caseswhere'there is a slight discrepancy between the actual angles betweenthe cranks ot' the engine and the correct angle also wear of the movingparts of the gear after a long period of usage may be taken up in thesame way.

i; small pulley M is also suitably attached to an internal slot l-Tforming part of the rocking lever A, the slot N being pro ided foradjusting the position of the puller M so as to give various lengths ofdiagrams suitable tor l ent sizes and types of indicators. The ends ofthe indicator cords are attached to and, by the rocking motion ini-:iarfed to the lerer it when the earn-shaft F is 11 motion, operates theengine indicator. rein the pulley M a lead It is taken rounn pulley S,litted to a convenient stationary partof the en ine, to connect with themain lead I which is suspended and held taut by two light tensionsprings U and it along the main lead I, means ar t rn-ed for attachingthe indi ater cords "v of. dicators (or recor means In place of thepulley M, described, I may employ any other suitable 'IOl'lll 01"attach- :nent.

In order 0 is reversed nllt i e ing' lever A is prey" tor Jr, whichengages the periphery of the 1 the rec in L pressu .the re th anextended 'itcr disc it,

ombined coingression i l 1L n pl ace orer tl Referring: to T, S and 9.these are similar to Fig a 1nd (5 but as applied to a two cycle on dia-Ret'erring to Figure it), th

from air the air and firing 'rc explained diagrams vary to the runnii ate coicition of the engines.

rlcz'on 0 the rocking zrclu-i ment or the rocking lever A in tic r rourcycle engine, i. e. the compression stroke, the lever, to which, ofcourse. the indi ator cord is attached, begins to acquire a rapid movement being at its fastest over the dean centre and afterwards slows downcorrespondingly until about 120 (or 60) degr es on the other side oi thedead centre, i. c. the expansion stroke. This action from these angleson both sides of the dead centre represent" one Glltll'c i'orward strokof the indicator, thus diagrammatically enla '1 the representation oithe incidents taking pl ice in the crlinder on the compression id aringstrok a mostapprecrible extent, which lllt'ltlt; l or ordinary pressureroluine diagram are the T. H. I. engine. i clai1n 1. In combina 'ien\vitl a fluid pres" e actuated motor revoluble element, a nieinher u:the end thereof ha-vh a l'OLft arrang -c axially of said shaft ant alsoan annular series ot recesses concentric with the lirsi iained recess, arocking ever havirq a longitudinal slot, a pin movable in said slot andengageable at will with any of the said cesses and an ind tor cordactuatlugmember mounted on said rock' lg lever able thereon.

'2. Indicator niecl'ianisin as claimed in claim 1, including asupporting bracket and a pin carried by said bracket, arranged parallelwith and adjustable about the axis or? said revoluble element and onwhich pin said rocking; lever is mounted.

3. Indicator ineclninism as c 1, in which the mcn'iber at t revolubleele nent i a d pr annular groove in i s periph r %1.l'(l rocking leveris shittable en said pin lo: eitndinallv with respect to said revolnhleelement said lever is provided with a rpunlrant which engages in saidgroove.

In witness whereof l nliix in unalurc.

ALEXANDER REID.

